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Section 142—Hydraulic Pump
35
CONTROL
SPRING
CONTROL
SPRING
OUTER SEAT
OM-414
Fig. 28—Control Spring Adjustment
making sure that the shoulder on the power take-off bushing is seated
in the recess in the forward end of the cam. Install the valve chambers
and new gaskets on the pump base. When installing the valve cham-
bers, be sure that the oil holes in the valve chamber are in line with
the oil passages in the pump base. There are right and left hand valve
chambers
and it is possible to interchange them.
The pipe plugs
should be on the same end of the pump as the control valves (fig.22).
143. HYDRAULIC
SYSTEM
ADJUSTMENTS.
The hydraulic
pump
is of precision manufacture
and does not
require adjustment.
The hydraulic
unit, however,
is composed
of
several
subassemblies
and
must
be carefully
adjusted
as outlined
below.
a. External Adjustments. There are two external adjustments
of the hydraulic unit. They may be made with the hydraulic unit
either on or off the tractor.
(1) ADJUSTMENT
OF
CONTROL
SPRING.
Place
the hy-
draulic touch control lever at the top of the quadrant, then turn the
outer control spring seat until there is no end play in the spring.
The preload on the control spring should be such that it is possible
to turn the spring with a thumb and two finger grip as shown in fig.
28.
3730-47)
§ 143. a. (1)
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